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GOAT Update Tanaz Angelina Mohayai, for the GOAT team November 16, - PowerPoint PPT Presentation

GOAT Update Tanaz Angelina Mohayai, for the GOAT team November 16, 2018 HPgTPC Meeting Purpose Reuse ALICE TPC Inner and Outer Readout Chambers ( IROC and ALICE TPC OROC ) for DUNE near detector high OROC pressure gaseous Argon (ND HP IROC


  1. GOAT Update Tanaz Angelina Mohayai, for the GOAT team November 16, 2018 HPgTPC Meeting

  2. Purpose Reuse ALICE TPC Inner and Outer Readout Chambers ( IROC and ALICE TPC OROC ) for DUNE near detector high OROC pressure gaseous Argon (ND HP IROC GAr) TPC: ALICE: operated @ 1 atm with Ne- CO 2 -N 2 gas mixture IROC/OROC 2 T. A. Mohayai 11-16-2018

  3. Purpose Reuse ALICE TPC Inner and Outer Readout Chambers ( IROC and ALICE TPC OROC ) for DUNE near detector high OROC pressure gaseous Argon (ND HP IROC GAr) TPC: ALICE: operated @ 1 atm with Ne- CO 2 -N 2 gas mixture IROC/OROC DUNE HP GAr TPC: will operate @ 10 atm with Ar-? gas mixture ALICE frontend electronics will not be provided 3 T. A. Mohayai 11-16-2018

  4. GOAT Test Stand G aseous-Argon O peration of the A LICE T PC, GOAT Test ALICE readout chambers at 10 atm and in Ar-? gas mixture (currently 90-10 Ar-CO 2 ) Field Cage Develop front-end electronics Main components: Drift: field cage Ortec IROC Signal readout: preamp ALICE IROC Front-end: preamps and CAEN 50 cm digitizers 4 T. A. Mohayai 11-16-2018

  5. GOAT Test Stand G aseous-Argon O peration of the A LICE T PC, GOAT Test ALICE readout chambers at 10 atm and in Ar-? gas mixture (currently 90-10 Ar-CO 2 ) Field Cage Develop front-end electronics Main components: Drift: field cage IROC Signal readout: ALICE IROC New Front-end: preamps Solution and CAEN 50 cm digitizers 5 T. A. Mohayai 11-16-2018

  6. PASA: an Intermediate Preamplifier Solution for GOAT 40-pads connection for readout with a single Ortec channel 16-channel PASA V out + P re- A mplifier S haping A mplifier, PASA : Intermediate solution before new ideas 16-channel charge sensitive shaping amplifier V out - Differential output – further upgrade to readout system required (a next step) 6 T. A. Mohayai 11-16-2018

  7. Previously on PASA IROC Signal Readout with PASA First attempt: Directly connected PASA to chamber (with original 40-pad setup) Led to disagreement between resulting signal and PASA response function Expected PASA Response Function Difgerential G 4 function after output Output subtraction 7 T. A. Mohayai 11-16-2018

  8. PASA Response to a Function Generator 190 ns FWHM 4mV input signal x 2pF capacitor = 8fC or 50k electrons, with 95mV amplitude/8fC = 11.8mV/fC gain (close to 12.75mV/fC conversion gain of PASA) Input signal: a 4 mV single pulse charging up a 2 pF capacitor Output signal from PASA: agrees with the expected 8 T. A. Mohayai 11-16-2018

  9. Summary and Next Steps Using a function generator, the PASA response function agrees with the expected G 4 distribution Further studies are underway to suppress the noise in the PASA board (current signal-to-noise ratio 10:1) Next steps: Develop new front-end scheme where PASA differential output is converted to a single output for input into CAEN Use PASA in a single-pad connection scheme (as opposed to the current 40-pad connection) 9 T. A. Mohayai 11-16-2018

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